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fine-structure constant |
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fine-structure constant [′fīn ‚strək·chər ′kän·stənt] (physics) A fundamental dimensionless constant, equal toe2/(4πε0ℏc) in International System (SI) units and toe2/(ℏc) in centimeter-gram-second (cgs) electrostatic units, whereeis the elementary charge, ℏ is Planck's constant divided by 2π,cis the speed of light, and ε0is the electric constant; numerically, it is equal to 0.007 297 352 533 ± 0.000 000 000 027 or to 1/(137.035 999 76 ± 0.000 000 50); symbolized α. Also known as Sommerfeld fine-structure constant. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Because the practical electrical units are linked (through theory) to the values of the fine structure constant, the charge of the electron, and the Plank constant, Eq. |
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